EQUTR                                                              Menu: PRISM
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Creates a triangular (equilateral) solid prism or a triangular (equilateral)
(2D) polygon.

        1. * (CHAR) plane of base triangle (x-xy,y-yz,z-zx) <x>
        2. * (POINT) starting point
        3. * (NUM) edge length
     for option `x':
        4. * (NUM) height of prism
     for options `y' or `z':
        4. * (NUM) length of prism
     for all options:
        5. * (Y/N) positive prism? <y>

Description:
This command creates a triangular (equilateral) 2D polygon or a triangular
(equilateral) solid prism based on the polygon.
Specify one of the axialplanes (x  xy plane, the default; y  yz plane, z  xz
plane). Define a starting point and edge length (greater than 0). Specify the
height (for `x' option) or the length (for `y' and `z' options). You may enter
`0' for a 2D polygon. Enter `y' for a positive prism, or `n' for a negative
prism. You are prompted to create more prisms until another command is
selected.
        Example: \equtr x 0 0 0 4 3 y
        Result:  A positive triangular prism is created with its starting
                 point at 0 0 0. The edge length is 4 units and height 3 units.
